This would require a bunch of photoshop work as well as CSS changes since those tabs are made up of two interconnected images. Those images would have to be recreated in the colors you wanted, uploaded to your media library and then the URLs of those new images inserted into the proper places in the CSS.

Wow--thanks timethief and sacred path for the prompt and clear responses.

I'm not ready to tackle anything this complicated yet. It's too bad! Digg had a lot of features I want. I want to make the switch from FrontPage to WP and I can get exactly the feature and colors--everything!--in Front Page.